ladr: LADR ladr: ladr: LADR (Library for Automated Deduction Research) is command-line ladr: versions of Prover9, Mace4, and other programs. Prover9 is an ladr: automated theorem prover for first-order and equational logic, and ladr: Mace4 searches for finite models and counterexamples ladr: ladr: ladr: remember to set the PROVER9HOME environment variable to ladr: /usr/share/prover9/bin. ladr: